<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script>
        window.onload = function(){
            var btnDom = document.querySelector("#btn");
            var e = new CustomEvent("myEvent",{
                detail:{
                    name:"tom",
                    age:23
                }
            });

            btnDom.addEventListener("myEvent",function(event){
                console.log("myEvent事件被触发",event);
            });

            btnDom.dispatchEvent(e);
        }
    </script>
</head>
<body>
    <input type="button" value="按钮" id="btn">
</body>
</html>